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G. DR EYPUS.

PERPETUAL CALENDAR. No. 506,003. Patented Oct 3, 1893.

3:5 P204 $22 372 2: mmg' UNITED STATES PATENT Quince.

GEORGE DREYFUS, OF PARIS, FRANCE.

PERPETUAL CALENDAR.

SPECIFICATION forming part of Letters Patent No. 506,003, dated October 3, 1893.

Application filed J annary 18, 1893. Serial No. 458,842. (No model.)

T0 at whom it may concern:

Be it known that I, GEORGE DREYFUs', a citizen of the Republic of France, and a resident of 32 Rue de Paradis, Paris, in the Republic of France, have invented certain new and useful Improvements in Perpetual Calendars; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention for improvements in perpetual calendars has for its object to group together in a small space, tables of the year, the day of the month, the month,and the day of the Week, for a considerable period in such manner that the name of the day of the Week of any date whatever can be easily, rapidly, and accurately obtained; or reciprocally the day of the month of which the year, the month and the day of the week and the particular week of the month are known.

A perpetual calendar according to this invention consists of a number card on which are marked in seven year columns and seven month columns respectively the number of the years for a desired period and the numbers 1 to 31 which are alwaysvisible, and of a name card carrying, in divisions corre-' sponding in size respectively to the width of a year and a month column,the names of the months and the names of the days of the week repeated in order several times and which card is adapted to be moved relatively to the number card the names and numbers being arranged on the cards so that the name of any month can be brought opposite a'ny column containing the numbers of the years and be visible, when the names of seven consecutive dayswill be opposite the month columns and will be visible and correspond withthe numbers in those columns for that year.

In order to provide for leap years the number of the leap year is inserted in two adja cent columns and January and February for leap years must be brought opposite one column containing the number of the leap year and the other months opposite the other column containing the same number, the num bers opposite which January and February are to be brought being distinguished in any suitable manner from the numbers opposite which the other months are to be brought.

The accompanying sheets of illustrative drawings show various modifications of a calendar constructed according to this invention.

Figure 1 is a face View of a calendar. Fig. 2 is a cross section of the same- Fig. 3 is a face view of the name card. Fig. 4 is a similar View to Fig. 3 showing a modified arrangement of the names of the days of the week and of the months. Figs. 5, 6 and 7 show a modification of the calendar described with reference to Fig. 4. Figs. 8, 9, 10 and 11 are similar views to Figs. 1, 2, 3, and 4 respectively, showing calendars with vertical sliding pieces instead of rotary. Figs. 11, 12, 13, 14 and 15 are similar views to Figs. 1, 2, 3 and 4 respectively, showing calendars with horizontal sliding pieces.

The name card B is circular and is adapted to rotate behind the number card Aon a pivot 0 fixed in the number card and passing axially through the name card. Portions of two annular rings are out out from the number card, the-axis of the said rings being at the pivot 0 and the inner radius of one ring being ,equal to the outer radius of the other ring so that portions of the name card B can be seen through the openings 0 d so formed. The numbers 1 to 31 are arranged consecutively on the number card in five parallel rows in seven columns corresponding to seven equal divisions of the week opening 0 and the numbers of the years are arranged on the same card in parallel rows in seven columns corresponding to seven equal divisions of the month opening d.

The name card B is formed with two annular rings e corresponding to the openings 0 d in the number card and divided by equally spaced radial lines so that seven divisions of either ring 6 or f are equal in length to the corresponding opening 0 or d in the number card. In the ring e the'name of a day of the week is inserted in each division the said names being placed in order and repeated several times. In the ring f the names of the months are inserted so that the name of each month occupies one division and so that the name of each month is in advance of the name of the preceding month byas many sponding to that name.

divisions as the number of days in the said preceding month is in excess of twenty eight. Thus February and March are on the same division and three divisions in advance of January, April is three divisions in advance of March, and May is two divisions in advance of April and so on. The numbers and names are so arranged on the cards that if the name of any month be brought opposite the column containing the number of a specified year then the name of each day of the week will be opposite a column containing the numbers of the days of the month corre- The numbers of the leap years are repeated in an adjacent column as shown and January and February of these years must be brought opposite the plain number and the other months opposite the number marked with an asterisk.

In the modification shown in Fig. 4 the names of those months which in non leap years begin with the same day of the week are grouped together so that they occupy only seven divisions and so that the names of the days of the week do not require to be repeated so often being contained in nineteen divisions only.

In the modification shown in Figs. 5, 6 and 7 the arrangement is similar to that shown in Fig. 4 except that the week opening and the month opening are made as one opening 0 and the names of the months, and days of the week are brought close together on the name card B which is in the form of a sector and requires to have only a limited motion. In this case the sector can be revolved round the pivot 0 fixed in the number card A.

Figs. 8, 9, 10 and 11 are similar views to Figs. 1, 2, 3 and 4 respectively, the name card B sliding vertically and across the number card A and between the two sets of seven horizontal columns containing the numbers 1 to 31 and the numbers of the years for the desired period. The week opening a and month opening d are straight. The pieces P gummed or otherwise fixed to the number card A served to keep the name card in position with respect to the number card.

Figs. 12, 13, 14 and 15 are similar views to Figs. 8, 9, 10 and 11 respectively showing the name card B sliding horizontally across the face of the number card A and between two sets of seven vertical columns containing the numbers 1 to 31 and the numbers of the years for the desired period. The name card passes at S from the face of the number card to the back through slots in the number card and at these parts the number card may be strengthened by the pieces P gummed or cemented to it.

The manner of working the calendar is as follows: For an ordinary year the name of the month is brought opposite the column containing the number of the year when the names of the days will correspond with the numbers 1 to 28, 1 to 29, l to 30 or 1 to 31, as the case may be. In leap years there are two adjacent columns containing the number of the year and the months of January and February are brought opposite one column and the remaining months are brought opposite the adjacent column and the number of the leap year in this latter column 18 provided with an asterisk, or is underlined or one of the said numbers is otherwise marked to distinguish it from the other all the leap years being of course distinguished in identically the same manner. When desired to find the name of the day corresponding to a given date, the name of the month is brought opposite the number of the year and the number of the day of the month will be opposite the name of the day required. For example the 15th day of May, 1891, was a Friday, the 15th day of May, 1896, will be a Friday, and the l5thdayofJanuary,l896,willbeaWednesday.

I am aware that previously to my invention perpetual calendars have been made in which each year for a period is placed under one or other of seven distinguishing marks and then if a name of a month is brought opposite the said letter the names of the days of the week will correspond with the numbers 1 to 31 for that year and month.

What I claim, and desire to secure by Letters Patent, is

1. A perpetual calendar consisting of a number card on which are marked in seven year columns and seven month columns respeetively the numbers of the years for a desired period and the numbers 1 to 31 which are always visible and of a name card carrying in divisions corresponding in size respectively to the width of a year and a month column, the names of the months and the names of the days of the week repeated in order several times and which card is adapted to be moved, relatively to the number card, the namesand numbers being arranged on the cards substantially as described so that the name of any month can be brought opposite any column containing the numbers of the years and be visible when the names of the seven consecutive days will be opposite the month columns and will be visible and correspond with the numbers in those columns for that year, so that the whole forms a calendar for the said period.

2. A perpetual calendar consisting of a number card on which are marked in seven year columns and seven month columns respectively the numbers of the years for a desired period and the numbers 1 to 31 which are always visible, and of a name card carrying in seven divisions corresponding in size to the width of a year column the names of the months, those months which in any non leap year begin with the same day of the week being inserted in the same division and in order according to the name of the first day of the month for that year and also carrying in nineteen divisions corresponding in size to the width of the month column the names of the days of the week repeated in order the cards being adapted to be moved relatively to one another and the names and numbers bein g arranged on the cards substantially as described so that when the seven divisions containing the names of the months are opposite the year columns and are visible the central seven divisions containing the names of the days are opposite the month columns and are visible, and that the whole forms aperpetual calendar for the said period. 7

3. A perpetual calendar consisting of a number card on which are marked in seven year columns and. seven month columns respectively the numbers of the years for a desired period and the numbers 1 to 31 whichare always visible and of a name card carrying in divisions correspondingin size respectively to the width of a year column and a month column the names of the months and the names of the days of the week repeated in order as specified and which card is adaptnumber card on which are marked in seven year columns and seven month columns respectively, the numbers of the years for a desired period. and the numbers 1 to 31 which are-always visible and of a name card carrying in seven divisions corresponding in size :to the width of a year column the names of the months, those months which in any non leap year begin with the same day of the week being inserted in the same division and in order according to the name of the first day of the month for that year and also carrying in nineteen divisions corresponding in size to the width of the month column the visible, and that the whole forms a perpetual calendar for the said period.

In testimony whereof I have affixed my signature in presence of two witnesses.

GEORGE DREYFUS.

Witnesses: R0131. M. HOOPER,

J. CHATEL. 

